SOUND GLASS-DESTRUCTION ALARM FOR GUARDING ALARM SYSTEM Russian patent published in 1999 - IPC

FIELD: radio engineering. SUBSTANCE: device has wide-band converter of acoustic signals into electric signal of sound frequency, for example, microphone, which output is connected to inputs of low-pass amplifiers (with band of 100 to 400 Hz) and high-pass amplifiers (with band of 6 to 10 kHz). In addition device has units for measuring signals from each channel, units for comparison of measured characteristics of signals to estimation for each channel, and decision making unit, which output is connected to alarm generator, noise detection units for each channel, unit for measuring slope of high-frequency channel signal and unit for judging expected signal characteristics. EFFECT: increased stability to noise, including detection of non-shock destruction of small regions, decreased probability of false alarms. 1 dwg